Adding feet to the dresser won't work well because of the toekick. Put it up on 4 cans of beans or tuna to emulate the look, pretty sure you won't like it. Make it more retro 50s, my 1956 bedroom set has the toekick at the bottom like your piece. I'd rather have nice stiletto feet like all my living room furniture but other than that it's wonderful and makes me happy. DLawless has MCM inspired hardware, was thinking the dished saucers but the chevron ones might be nice! If you can figure out how to remove the toekick or are brave enough to cut part of the centers out so it looks like feet go for it though. I'd do skinny and only as tall as the toekick or proportions would get wonky. I tried and failed to finish smocked round pillows, very retro. Piped around squares and squares with buttons in the center are MCM or you could buy pillow covers made from one of the iconic fabrics from Girard or Eames or a Calder inspired mobile or 'atomic' then pull a color for the ottoman. You can get incredible deals on eBay for fabric remnants, search Maharam and you get more suggestions under the search bar. Have fun searching for a new chair. Looks like you have a great spot for a nice wide comfy chair like a Womb or Bird or Wegner Shell/Wing or Egg.

Good ideas above, and I notice the pictures over the sofa are hung way too high. They would be better at about 6" over the top of the sofa. I would also address the mantel and find some mid-century glass or porcelain vases of the period and arrange a grouping up there along with a interesting lamp if there is an outlet up there. Looks kind of bare and lonesome right now. Could you put a wood box shelf under the TV to kind of ground the TV? It should be the length of the TV or a little longer. A low metal piece on the coffee table would finish off the overall look.

I don’t love the dining table it looks a bit light in the space , I find the lamp in the LR a bit large scaled for the sofa and you need a lot more lighting . Maybe George Nelson lights above the table but I would like to see a wood base on the table with some teak chairs maybe. I think the LR pieces are awesome and I think I would reupholster in the same colors . I think with a bit of a hunt you can find better art though. Now that you have gone down the rabbit hole

Regarding the rug, the color is great but a touch too traditional in design. No matter what you choose, you‘ll be tied to It. If it has more colors, you can go bold or use more subdued shades when you tire of a look.